New Lithium Ionic Conductor, Thio-LISICON, and Its Application to All Solid-State Ceramic Battery

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  • 新機能材料開発と構造科学　　１．構造と機能　　全固体電池のための高イオン導電体チオリシコンの開発，機能と構造
  • ゼン コタイ デンチ ノ タメ ノ コウイオン ドウデンタイ チオリシコン ノ カイハツ キノウ ト コウゾウ

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Abstract

New lithium ionic conductor, thio-LISICON (LIthium Super Ionic CONductor) is reviewed. The thio-LISICON has a general composition of Li4-x M1-yM'yS4, where the M and M' are Ge, Si or P, Al, Ga, respectively. In the thio-LISICON family, Li3.25Ge0.25P0.75S4 showed the highest conductivity of 2.2 × 10-3 Scm-1 at 25 °C among the materials synthesized, and the conductivity value is comparable to or even higher than liquid-electrolytes. The thio-LISICON has a structure similar to the γ-Li3PO4 type. Materials relationships to the oxides LISICON family is indicated. The advantages of the solid electrolyte to all solid-state lithium battery are discussed.

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